Which browser is faster :<
This is a little trick picked up from book "Prctical Javascript DOM Scripting and Ajax Projects".
Only constructs a string that consists of the sring "This is a test string" 10,000 times.
1 <html>
2 <head>
3 <title>Listing 1-2</title>
4 <script type="text/javascript">
5 function badTest() {
6 var startTime = new Date().valueOf();
7 var s = "";
8 for (var i = 0; i < 10000; i++) {
9 s += "This is a test string";
10 }
11 return new Date().valueOf() - startTime;
12 }
13 function goodTest() {
14 var startTime = new Date().valueOf();
15 var stringBuffer = new Array();
16 for (var i = 0; i < 10000; i++) {
17 stringBuffer.push("This is a test string");
18 }
19 var s = stringBuffer.join("");
20 return new Date().valueOf() - startTime;
21 }
22 function betterTest() {
23 var startTime = new Date().valueOf();
24 var stringBuffer = new Array();
25 for (var i = 0; i < 10000; i++) {
26 stringBuffer[stringBuffer.length] = "This is a test string";
27 }
28 var s = stringBuffer.join("");
29 return new Date().valueOf() - startTime;
30 }
31 function doTests() {
32 var htm = "";
33 htm += "Time badTest took: " + badTest() + "<br>";
34 htm += "Time goodTest took: " + goodTest() + "<br>";
35 htm += "Time betterTest took: " + betterTest();
36 document.getElementById("result").innerHTML = htm;
37 }
38 </script>
39 </head>
40 <body>
41 <a href="javascript:void(0);" onClick="doTests();">Click here to test</a>
42 <br /><br />
43 <div id="result"> </div>
44 </body>
45 </html>
2 <head>
3 <title>Listing 1-2</title>
4 <script type="text/javascript">
5 function badTest() {
6 var startTime = new Date().valueOf();
7 var s = "";
8 for (var i = 0; i < 10000; i++) {
9 s += "This is a test string";
10 }
11 return new Date().valueOf() - startTime;
12 }
13 function goodTest() {
14 var startTime = new Date().valueOf();
15 var stringBuffer = new Array();
16 for (var i = 0; i < 10000; i++) {
17 stringBuffer.push("This is a test string");
18 }
19 var s = stringBuffer.join("");
20 return new Date().valueOf() - startTime;
21 }
22 function betterTest() {
23 var startTime = new Date().valueOf();
24 var stringBuffer = new Array();
25 for (var i = 0; i < 10000; i++) {
26 stringBuffer[stringBuffer.length] = "This is a test string";
27 }
28 var s = stringBuffer.join("");
29 return new Date().valueOf() - startTime;
30 }
31 function doTests() {
32 var htm = "";
33 htm += "Time badTest took: " + badTest() + "<br>";
34 htm += "Time goodTest took: " + goodTest() + "<br>";
35 htm += "Time betterTest took: " + betterTest();
36 document.getElementById("result").innerHTML = htm;
37 }
38 </script>
39 </head>
40 <body>
41 <a href="javascript:void(0);" onClick="doTests();">Click here to test</a>
42 <br /><br />
43 <div id="result"> </div>
44 </body>
45 </html>
Take a lookat the result:(Amazing)
1. IE 7.0.6000.16512
Results:
Time badTest took: 903
Time goodTest took: 57
Time betterTest took: 24
2. Firefox 2.0.0.7
Results:
Time badTest took: 8
Time goodTest took: 34
Time betterTest took: 30
3. Navigator 9.0b3
Results:
Time badTest took: 12
Time goodTest took: 34
Time betterTest took: 24
4.Opera 9.22
Results:
Time badTest took: 5
Time goodTest took: 17
Time betterTest took: 12
All browsers do a lot for optimizing their Javascript engine except IE
Time goodTest took: 57
Time betterTest took: 24
2. Firefox 2.0.0.7
Results:
Time badTest took: 8
Time goodTest took: 34
Time betterTest took: 30
3. Navigator 9.0b3
Results:
Time badTest took: 12
Time goodTest took: 34
Time betterTest took: 24
4.Opera 9.22
Results:
Time badTest took: 5
Time goodTest took: 17
Time betterTest took: 12
All browsers do a lot for optimizing their Javascript engine except IE
